git ssb

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var fs         = require('fs')
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var mkdirp     = require('mkdirp')
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var path       = require('path')
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var u          = require('./util')
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function isObject (o) {
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  return 'object' === typeof o
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}
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function isFunction (f) {
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  return 'function' === typeof f
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}
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function empty(v) { return !!v }
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function toFile (filename) {
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  if(isObject(filename))
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    return path.join(filename.path, 'secret')
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  return filename
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}
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module.exports = function (generate) {
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  if(!fs || !fs.readFile)
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    return require('./local-storage')(generate)
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  var exports = {}
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  //(DE)SERIALIZE KEYS
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  function constructKeys(keys, legacy) {
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    if(!keys) throw new Error('*must* pass in keys') 
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    return [
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    '# this is your SECRET name.',
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    '# this name gives you magical powers.',
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    '# with it you can mark your messages so that your friends can verify',
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    '# that they really did come from you.',
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    '#',
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    '# if any one learns this name, they can use it to destroy your identity',
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    '# NEVER show this to anyone!!!',
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    '',
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    legacy ? keys.private : JSON.stringify(keys, null, 2),
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    '',
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    '# WARNING! It\'s vital that you DO NOT edit OR share your secret name',
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    '# instead, share your public name',
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    '# your public name: ' + keys.id
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    ].join('\n')
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  }
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  function reconstructKeys(keyfile) {
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    var privateKey = keyfile
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      .replace(/\s*\#[^\n]*/g, '')
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      .split('\n').filter(empty).join('')
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    //if the key is in JSON format, we are good.
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    try {
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      var keys = JSON.parse(privateKey)
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      if(!u.hasSigil(keys.id)) keys.id = '@' + keys.public
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      return keys
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    } catch (_) { console.error(_.stack) }
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  }
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  exports.load = function(filename, cb) {
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    filename = toFile(filename, 'secret')
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    fs.readFile(filename, 'ascii', function(err, privateKeyStr) {
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      if (err) return cb(err)
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      var keys
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      try { keys = reconstructKeys(privateKeyStr) }
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      catch (err) { return cb(err) }
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      cb(null, keys)
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    })
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  }
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  exports.loadSync = function(filename) {
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    filename = toFile(filename, 'secret')
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    return reconstructKeys(fs.readFileSync(filename, 'ascii'))
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  }
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  exports.create = function(filename, curve, legacy, cb) {
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    if(isFunction(legacy))
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      cb = legacy, legacy = null
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    if(isFunction(curve))
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      cb = curve, curve = null
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    filename = toFile(filename, 'secret')
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    var keys = generate(curve)
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    var keyfile = constructKeys(keys, legacy)
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    mkdirp(path.dirname(filename), function (err) {
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      if(err) return cb(err)
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      fs.writeFile(filename, keyfile, {mode: 0400}, function(err) {
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        if (err) return cb(err)
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        cb(null, keys)
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      })
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    })
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  }
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  exports.createSync = function(filename, curve, legacy) {
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    filename = toFile(filename, 'secret')
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    var keys = generate(curve)
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    var keyfile = constructKeys(keys, legacy)
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    mkdirp.sync(path.dirname(filename))
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    fs.writeFileSync(filename, keyfile, {mode: 0400})
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    return keys
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  }
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  return exports
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}
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